查找以字符串AS3开头的字符串

Question

我想阻止用户使用网络摄像头模拟器，我通过使用senocular的函数在AS2中完成了这项工作，但是我无法使其在AS3中工作，所以，这里是old version by senocular，我想在AS3，尝试使用indexOf，但不起作用，我需要找到至少字符串的前4个字符，并将它们与AS3中的数组内的项目进行比较！

String.prototype.startsWith = function(str){ 
     return !this.indexOf(str); 
    } 

这里是我想做的事：

var bannedDevices = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); 

var myDeviceName = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; 

if (myDeviceName.indexOf(bannedDevices)){ 
    trace("banned device"); 
} 

感谢您的帮助！

Answer 1

好的，我留下我以前的答案为历史。现在，我知道你想要什么：

public function FlashTest() { 
    var bannedDevices:Array = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); 

    var myDeviceName:String = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; 

    trace(startsWith(myDeviceName, bannedDevices, 4)); 
} 

/** 
* @returns An array of strings in pHayStack beginning with pLength first characters of pNeedle 
*/ 
private function startsWith(pNeedle:String, pHayStack:Array, pLength:uint):Array 
{ 
    var result:Array = []; 
    for each (var hay:String in pHayStack) 
    { 
     if (hay.match("^"+pNeedle.substr(0,pLength))) 
     { 
      result.push(hay); 
     } 
    } 
    return result; 
} 

Answer 2

您的需求并不十分清晰...这是一个函数，它返回以给定字符串开头的数组中的每个字符串。

public function FlashTest() { 
    var hayStack:Array = ["not this one", "still not this one", "ok this one is good", "a trap ok", "okgood too"]; 

    trace(startsWith("ok", hayStack)); 
} 

/** 
* @returns An array of strings in pHayStack beginning with the given string 
*/ 
private function startsWith(pNeedle:String, pHayStack:Array):Array 
{ 
    var result:Array = []; 
    for each (var hay:String in pHayStack) 
    { 
     if (hay.match("^"+pNeedle)) 
     { 
      result.push(hay); 
     } 
    } 
    return result; 
}